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排序方式: 共有138条查询结果,搜索用时 15 毫秒
131.
132.
E.W. Dias A.P. Baêta Scarpelli L.C.T. Brito M. Sampaio M.C. Nemes 《The European Physical Journal C - Particles and Fields》2008,55(4):667-681
We extend a constrained version of implicit regularization (CIR) beyond one-loop order for gauge field theories. In this framework,
the ultraviolet content of the model is displayed in terms of momentum loop integrals order by order in perturbation theory
for any Feynman diagram, while the Ward–Slavnov–Taylor identities are controlled by finite surface terms. To illustrate, we
apply CIR to massless abelian gauge field theories (scalar and spinorial QED) to two-loop order and calculate the two-loop
beta-function of spinorial QED.
PACS 11.10.Gh; 11.15.Bt; 11.15.-q 相似文献
133.
Gergő Nemes 《Studies in Applied Mathematics》2015,135(1):86-116
In this paper, we derive a new representation for the incomplete gamma function, exploiting the reformulation of the method of steepest descents by Howls 1992. Using this representation, we obtain numerically computable bounds for the remainder term of the asymptotic expansion of the incomplete gamma function with large a and fixed positive λ, and an asymptotic expansion for its late coefficients. We also give a rigorous proof of Dingle's formal result regarding the exponentially improved version of the asymptotic series of . 相似文献
134.
A. Eremin L. Naji A. Nemes R. Stannarius M. Schulz K. Fodor‐Csorba 《Liquid crystals》2013,40(7):789-794
A wide variety of morphologies, such as screw‐like filaments, ribbons, etc., have been observed in polarizing microscopy studies of the B7 phase in a melt or with free surface. In this paper, we present the results of AFM and scanning electron microscopy measurements of structures formed by a columnar‐type B7 phase. These measurements are aimed at elucidating the three‐dimensional structure of the observed patterns. 相似文献
135.
Balázs B. Berkes Ákos Nemes Colin E. Moore Franciska Szabó György Inzelt 《Journal of Solid State Electrochemistry》2013,17(12):3067-3074
The electrochemical quartz crystal nanobalance was employed to study the electropolymerization of 6-aminoindole on gold electrodes in acidic media. Potentiostatic or potential cycling electrooxidation of 6-aminoindole below 0.5 V vs. saturated calomel electrode leads to the formation of multilayer polymeric films, while at higher positive potentials, further oxidation takes place resulting in a different material which remains attached to the metal surface but shows decreased or no redox activity. A mechanism of the redox transformations of poly(6-aminoindole) which involves protonation–deprotonation accompanying the electron transfer is suggested. In this potential range, a yellow-green reversible color change occurs. At higher positive potentials blue-purple, indigo-type compounds are formed, and bond-breaking leads to the decrease of the electroactivity. 相似文献
136.
Molecular imaging by Mid-IR laser ablation mass spectrometry 总被引:1,自引:0,他引:1
Akos Vertes Peter Nemes Bindesh Shrestha Alexis A. Barton Zhaoyang Chen Yue Li 《Applied Physics A: Materials Science & Processing》2008,93(4):885-891
Mid-IR laser ablation at atmospheric pressure (AP) produces a mixture of ions, neutrals, clusters, and particles with a size
distribution extending into the nanoparticle range. Using external electric fields the ions can be extracted and sampled by
a mass spectrometer. In AP infrared (IR) matrix-assisted laser desorption ionization (MALDI) experiments, the plume was shown
to contain an appreciable proportion of ionic components that reflected the composition of the ablated target and enabled
mass spectrometric analysis. The detected ion intensities rapidly declined with increasing distance of sampling from the ablated
surface to ∼4 mm. This was rationalized in terms of ion recombination and the stopping of the plume expansion by the background
gas. In laser ablation electrospray ionization (LAESI) experiments, the ablation plume was intercepted by an electrospray.
The neutral particles in the plume were ionized by the charged droplets in the spray and enabled the detection of large molecules
(up to 66 kDa). Maximum ion production in LAESI was observed at large (∼15 mm) spray axis to ablated surface distance indicating
a radically different ion formation mechanism compared to AP IR-MALDI. The feasibility of molecular imaging by both AP IR-MALDI
and LAESI was demonstrated on targets with mock patterns.
Presented at the 9-th International Conference on Laser Ablation, 2007 Tenerife, Canary Islands, Spain 相似文献
137.
Findeisen-Tandel S Schröder MW Pelzl G Baumeister U Weissflog W Stern S Nemes A Stannarius R Eremin A 《The European physical journal. E, Soft matter》2008,25(4):395-402
We report a novel type of electro-optical switching in a tilted smectic phase of bent-shaped mesogens. The switching consists of a continuous stage and two bistable transitions. Detailed optical and electro-optical measurements using high-speed imaging are given and possible interpretations of the experimental results are discussed. 相似文献
138.
A. P. Baêta Scarpelli Marcos Sampaio M. C. Nemes B. Hiller 《The European Physical Journal C - Particles and Fields》2008,56(4):571-578
The radiative induction of the CPT and Lorentz violating Chern–Simons (CS) term is reassessed. The massless and massive models
are studied. Special attention is given to the preservation of gauge symmetry at higher orders in the background vector b
μ
when radiative corrections are considered. Both the study of the odd and even parity sectors of the complete vacuum polarization
tensor at one-loop order and a non-perturbative analysis show that this symmetry must be preserved by quantum corrections.
As a complement we obtain the result that transversality of the polarization tensor does not fix the value of the coefficient
of the induced CS term. 相似文献